[Idea] Curses + Smiting Necromancer

I've been thinking about how I can get a necro that can perform well in the Hall of Heroes, since necromancer is generally seen as a "secondary class" in the halls where soul reaping doesn't help much at all. I want to use a necromancer to deal tons of shadow damage at once. To augment this, I decided to throw in smiting for the same reason -- it ignores armor. Here is my idea for a build. Please help me out, since I've only ever used the necromancer class as a secondary class so I'm not too familiar with it. Also, self healing for life sacrifice isn't much of a problem to me, since I will have atleast one healer well aware that I will be killing myself =)

Attributes:
Curses 12 +1 hat + 3 rune = 16
Smiting 10 = 10
Blood 8 +1 rune = 9

Skills: Here is where I need help. I'll post what I think will work, but I want help on these.
Symbol of Wrath - For 5 seconds, foes in this location take 8-27 Holy damage each second. (5 energy, 30s delay)
Banish - Target foe takes 20-49 Holy damage. (5 energy, 10s delay)
Dark Pact - Sacrifice 10% maximum health and deal 10-40 shadow damage to target foe. (5 energy, 2s delay)
Spiteful Spirit {E} - For 8-18 seconds, whenever target foe attacks or uses a skill, Spiteful Spirit deals 5-29 shadow damage to that foe and all adjacent foes. (15 energy, 10s delay)
Mark of Pain - For 30 seconds, whenever target foe takes physical damage, Mark of Pain deals 10-34 shadow damage to adjacent enemies. (10 energy, 30s delay)
Barbs - Target foe takes 1-8 damage when hit by physical damage. (10 energy, 30s delay)
Desecrate Enchantments - Target foe and all nearby foes take 6-49 shadow damage and 4-17 shadow damage for each enchantment on them. (15 energy, 15s delay)
Awaken the Blood - For 20-39 seconds, you gain +2 Blood Magic and +2 Curses, but whenever you sacrifice health, you sacrifice 50% more than the normal amount. (10 energy, 45s delay)

Well, that was just a rough idea. Enough to get by the forum rules =) I'm pretty sure that it won't work in its current state, but you get my intent. A big nuke full of unresistable damage =) Please, help me make this build decent. The level 18 curses should be fun to use.